dump the config file again to verify the changes took effect and you didn't stomp it

cat /etc/sysctl.conf

I rebooted to make sure the change was effected and my WiFi behaved as it should.

I hope this makes a difference for you.

Solution:2

Erratic speed on a wireless link is often related to interference. Also it can be caused by another wlan in proximity that is using the same channel. Try changing the transmission channel of your modem/router.

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